Adds Dark Sky Forecast API

README.md

@@ -136,6 +136,7 @@ A collective list of JSON APIs for use in web development.
 | Wunderground | Weather | No | [Go!](http://www.wunderground.com/weather/api/) |
 | OpenWeatherMap | Weather | No | [Go!](http://openweathermap.org/api) |
 | Yahoo! Weather | Weather | No | [Go!](https://developer.yahoo.com/weather/) |
+| Dark Sky Forecast API | Weather | No, but  `apiKey` query string | [Go!](https://developer.forecast.io/) |
 | World Bank | World Data | No | [Go!](http://data.worldbank.org/developers) |
 | Open Notify | ISS astronauts, current location API | No | [Go!](http://open-notify.org/Open-Notify-API/) |
 | Fedger.io | Query machine intelligence data | No | [Go!](https://dev.fedger.io/docs/) |